Centrifugal pump



Nov. 20 1 923 A. S. TELFER CENTRIFUGAL PUMP Original Filed March l7.

33. r f llll v Patented Nov. 20, 1923. UNITED STATES PATENT, OFFICE.

ARCHIBA-LD S. TELFEit, OF HOUSTON, TEXAS.

CENTRIFUGAL PUMP.

Application filed March 17, 1922. Serial No. 544,870. Renewed September 4, 1928'.

To alive/10711. it may com-arm Be it known that I, AncnInALn l. TELPER, a citizen of. the United States, residing at Houston, in the county of Harris and State of Texas, have invented certain new and useful Improvements in a Centrifugal Pump, of which the following is a specification.

This invention relates to new and useful improvements in a centrifugal pump.

One object of the invention is, to provide an attachment which will prevent the liquid being pumped from leaking out along the impeller shaft and being wasted.

backinto the volume of fluid being pumped andthe rest working along the shaft in the other direction past the packing rings 6, and leaking out and being wasted. Tominimize 50 the leakage "of the fluid past the packing 6 I have provided an attachment which will now be described, the parts hereinbefore referred to bein of conventional form and common to centrifugal pumps.

Just outside of the sealing rings 8, I have located an inside and an outside washer s and 11. These washers are spaced apart and they fit closely within the bore of the casing and fit suu 1y on the shaft 2 so as Another object of the invention is to pro- I vide an attachment of thecharacter described, which is of very simple construction, and consequently which may be cheaply and easily manufactured and readily applied to the pump.

With the above and other objects in View the invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings, wherein The figure shows a side view section of a centrifugal pump.

Referring now more particularly to the drawing, the numeral 1 designates the easing, as a whole. Rotatably mounted in this casing there is the impeller shaft 2, to which the impeller blades 3 are secured. By the rotation of these blades thefiuid is drawn into the inlet chamber 4 and forced from said chamber into the discharge chamber 5 and thence discharged through the dischar e outlet. The impeller shaft is provide with suitable packing rings as 6, at

partially in each'side of the casing, which are confined.

by means of suitable glands 7, 7.

In operating centrifugal pumps it is often necessary to use a liquid seal to prevent the leakage of air, and also to keep the pump cool. To provide for this liquid seal suitable sealing rings as 8 are employed, one on each side of the impeller, and lines 9 lead from the discharge chamber 5 to the sealing rings through which liquid is delivered to said rings at approximately the discharge pressure of the pum The li uid seals around the shaft are t us pro vi ed. Liquid coming through the lines 9 has a tendency to leak along the shaft in each direction, part of it finding. its way to provide as sma amount of clearings as possible for the leakage of the fluid past them. Between these washers there is located a ring 12 provided with a clearance between it and the shaft and also between it and the wall of the bore in the casing. This ring has-a plurality of radiating bores. 13 through it. I Connecting the suction and discharge chambers of the pump are the pipes 14,14. I" have provided the suction lines 15', 15 whose inner ends register with the respective rings 12. The outer ends of the suction. lines 15 are fitted throu h the respective'pipes 14 and are overturned tion chambers 4 and are formed into contracted discharge nozzles 16. The pipes 14, just beyond t'hfejnozzles 16 are contracted as at 17 to gives-stronger suction, givin the effect of an ejector, thus which is leaked along the shaft through said suction pipes 15 and discharge it into the pipes 14 through which it will find its way back into the chamber 4 and practically none of the liquid will work on along theshaft past the packing 6.

In order to have this ejector effect the pipes 14 will receive their liquid at the pressure equal to the dischar e pressure of the pump. "This will be muc the pressure of the liquid in the annular pocket around the ring 12. For this reason the liquid leaking along the shaft, ast the ring 12 will be readily picked up, an sucked through the pipes 15 and delivered into the 1 5 pipes 14 to be returned to the suction side of the pum What I c aim is 1. A centrifugal pump, having a casing containin a suction chamber and a dis- 110 charge chamber, a pipe connecting said chambers through which fluid is forced toward the inlet, or suc- 8!? drawing the liquid 90 v greater than from the latter to the former, an impeller shaft having a bearing in the pump casing,

an impellerfixed thereon, a fluid conduit leading from the shaft bearing and enteri 11;; said pipe and formed into an ejector nozzle within said pipe. 3 v

2. In a centrifugal pump, a suction chamber, a discharge chamber, an impeller through which. fluid is forced from the former to thelatter, an impeller shaft to which said impeller is fixed, bearings in which said shaftrotates, a pipe connecting said chambers, .a suction conduit leading from one of said bearings and entering said pipe whose end is formed into an ejector nozzle within said pipe.

3. In a centrifugal pump, a casin having a suction chamber and a discharge c iamber,

and to which said impeller is secured, a pair oi pipes connecting said chambers, each pipe having a restricted suction, a pair of suction conduits leading from the shaft 25 bearings and entering said respective pipes and whose ends within said pipes are formed into ejector nozzles which are turned toward said restricted sections.

In testimony whereof I have signed in 30 name to this specification in the' presence of two subscribing witnesses.

ARCHIBALD Q. 'IELFER. itnessesz V. H. DUNLAY,

WM; A. CATHEY. 

